Experimental and simulation study of the physical foaming process using high-pressure CO 2

Sun, Ying; Ueda, Yumi; Suganaga, Hiroyuki; Haruki, Masashi; Kihara, Sorin; Takishima, Shigeki

doi:10.1016/j.supflu.2015.08.001

Cited by 24 publications

(21 citation statements)

References 24 publications

(35 reference statements)

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“…Similar with the cell size, the maximum cell densities of both PP1/WF composites and PP2/WF composites were obtained at the speed of 2 rpm. On one hand, the high melt pressure caused by the increased screw speed provided a higher ambient pressure [24]. To overcome the ambient pressure and the interfacial energy, a higher driving force of bubble nucleation was needed, which led to the decrease of the cell density.…”

Section: Effect Of the Screw Speed On The Properties Of Composites 3mentioning

confidence: 99%

Effect of processing conditions on the microstructure of microcellular PP/WF composites prepared by the continuous extrusion molding technology

Wang

Chen

Jia

et al. 2019

Mater. Res. Express

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The polypropylene (PP) and wood flour (WF) were mixed first and then extruded by a single-screw extruder foaming system to prepare the microcellular wood-polymer composites (WPCs) in this article. In addition to PP and WF, polyolefin elastomer (POE), talc powders and other fillers were also added to improve the cell structures of the samples. And two types of PP resins were introduced to the formulation of the composites to study the effect of the molecular chain structure on the rheological properties of the samples. Besides, the effects of processing conditions, such as die temperature and screw speed, on the properties of the samples were also investigated. The experimental results indicate that compared with PP1, the complex viscosity of PP2 decreased faster with the shear rate because of the linear molecular chain structure. Besides, the maximum impact strength of PP2/WF composites was 138.5 % higher than that of PP1/WF composites, while the tensile and flexural strength of PP2/ WF composites were much lower. In addition, the best microcellular structure and the maximum impact strength were also obtained with the die temperature of 190°C and the screw speed of 2 rpm.

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Section: Effect Of the Screw Speed On The Properties Of Composites 3mentioning

confidence: 99%

Effect of processing conditions on the microstructure of microcellular PP/WF composites prepared by the continuous extrusion molding technology

Wang

Chen

Jia

et al. 2019

Mater. Res. Express

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“…Dabei wurde die Bildung von CO 2 ‐Gasblasen analysiert. Eine zuverlässige modellgestützte Regelung solcher Nukleationsvorgänge ist insbesondere für die Produktion von Schaumstoffen von Interesse , . MD‐Simulationen mit bis zu 10 8 Wechselwirkungszentren wurden bei Temperaturen von 220 und 280 K durchgeführt, und die Entwicklung der Gasblasenpopulation analysiert (Abb.…”

Section: Massiv‐parallele Molekulardynamik‐simulation Der Gasblasenbiunclassified

SkaSim – Scalable HPC Software for Molecular Simulation in the Chemical Industry

Vrabec

Bernreuther

Bungartz

et al. 2018

Chemie Ingenieur Technik

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Der vorliegende Übersichtsartikel berichtet über Fortschritte in der molekularen Modellierung und Simulation mittels massiv‐paralleler Hoch‐ und Höchstleistungsrechner (HPC). Im SkaSim‐Projekt arbeiteten dazu Partner aus der HPC‐Community mit Anwendern aus Wissenschaft und Industrie zusammen. Ziel dabei war es mittels HPC‐Methoden die Vorhersage von thermodynamischen Stoffdaten in Bezug auf Effizienz, Qualität und Zuverlässigkeit weiter zu optimieren. In diesem Zusammenhang wurden verschiedene Themen bearbeitet: Atomistische Simulation der homogenen Gasblasenbildung, Oberflächenspannung klassischer Fluide und ionischer Flüssigkeiten, multikriterielle Optimierung molekularer Modelle, Weiterentwicklung der Simulationscodes ls1 mardyn und ms2, atomistische Simulation von Gastrennprozessen, molekulare Membran‐Strukturgeneratoren, Transportwiderstände und gemischtypenspezifische Bewertung prädiktiver Stoffdatenmodelle.

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“…To monitor the bubble growth and optimize the SCF process, it is required to model the process besides experimental investigation. For this purpose, many models have been developed based both on the law of conservation of mass and on the law of conservation of momentum, together with a modified version of the classical nucleation rate theory 10–12. Despite the accuracy of these models, their numerical solution involves several iteration loops, which significantly increases the computation cost.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Two‐Step Supercritical CO₂ Foaming to Fabricate Poly(ε‐caprolactone) Scaffolds

2021

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A mathematical model was developed based on the Amon and Denson model for supercritical foaming (SCF) with a two‐step depressurization rate. The model was provided according to the law of conservation of momentum, the law of conservation of mass, and a reformulation of the shell size for the second step of depressurization in comparison with the shell size for the first step of depressurization. The model was validated using the experimental data of SCF from polycaprolactone plus CO2 at 300 bar, 50 °C, a solubilization time of 2 h, a first depressurization rate of 28.6 bar min−1, and a second depressurization rate of 200 bar min−1. The comparison showed a significant improvement of the model accuracy for predicting the average pore radius of the scaffold compared to the original Amon and Denson model.

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Experimental and simulation study of the physical foaming process using high-pressure CO 2

Cited by 24 publications

References 24 publications

Effect of processing conditions on the microstructure of microcellular PP/WF composites prepared by the continuous extrusion molding technology

Effect of processing conditions on the microstructure of microcellular PP/WF composites prepared by the continuous extrusion molding technology

SkaSim – Scalable HPC Software for Molecular Simulation in the Chemical Industry

Modeling of Two‐Step Supercritical CO₂ Foaming to Fabricate Poly(ε‐caprolactone) Scaffolds

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Experimental and simulation study of the physical foaming process using high-pressure CO 2

Cited by 24 publications

References 24 publications

Effect of processing conditions on the microstructure of microcellular PP/WF composites prepared by the continuous extrusion molding technology

Effect of processing conditions on the microstructure of microcellular PP/WF composites prepared by the continuous extrusion molding technology

SkaSim – Scalable HPC Software for Molecular Simulation in the Chemical Industry

Modeling of Two‐Step Supercritical CO2 Foaming to Fabricate Poly(ε‐caprolactone) Scaffolds

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Modeling of Two‐Step Supercritical CO₂ Foaming to Fabricate Poly(ε‐caprolactone) Scaffolds